Full Feedforward of Grid Voltage for Grid-Connected Inverter With LCL Filter to Suppress Current Distortion Due to Grid Voltage Harmonics

Wang, Xuehua; Ruan, Xinbo; Liu, Shangwei; Tse, Chi K.

doi:10.1109/tpel.2010.2077312

Cited by 315 publications

(140 citation statements)

References 23 publications

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“…AD strategies based on feedback compensation are in essence the same while their differences mainly lie in the choice of states for feedback. Typical applications of proportional i C1 feedback can be found in [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. For 1 storder derivative feedback of u C1 , a high-pass filter (HPF) with a similar response is an alternative solution [35].…”

Section: Ad Subject To Different Options Of Single Statementioning

confidence: 99%

“…Consequently, grid voltage harmonics in the case of u C1 , i C1 , i L1 and u L1 feedback will have extra impact on the grid current quality. For this reason, the full feedforward method uses a 1 st -order derivative feedforward of u g to improve the grid current quality in [19] and [47]. The above investigations are also synthesized in Table 4.…”

Section: Current Distortion Caused By Grid Voltage Harmonicsmentioning

confidence: 99%

“…Filter-based AD improves stability by adding a digital filter next to the current controller [11][12][13][14][15][16]. For feedbackbased AD, the state used for feedback can be the capacitor current [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], the capacitor voltage [33][34][35][36], the inverterside current [37], the grid current [38][39][40][41] or a combination of multiple states [42][43][44][45][46][47][48][49][50]. Among the feedback-based AD methods, proportional feedback of capacitor current is widely studied during last decade due to its simple implementation.…”

Section: Introductionmentioning

confidence: 99%

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LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Xie

2017

J. Mod. Power Syst. Clean Energy

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Grid-connected LCL-filtered inverters are commonly used for distributed power generators. The LCL resonance should be treated properly. Recently, many strategies have been used to damp the resonance, but the relationships between different damping strategies have not been thoroughly investigated. Thus, this study analyses the essential mechanisms of LCL-resonance damping and reviews state-of-the-art resonance damping strategies. Existing resonance damping strategies are classified into those with single-state and multi-state feedback. Singlestate feedback strategies damp the LCL resonance using feedback of a voltage or current state at the resonance frequency. Multi-state feedback strategies are summarized as zero-placement and pole-placement strategies, where the zero-placement strategy configures the zeros of a novel state combined by multi-state feedback, while the poleplacement strategy aims to assign the closed-loop poles freely. Based on these mechanisms, an investigation of single-state and multi-state feedback is presented, including detailed comparisons of the existing strategies. Finally, some future research directions that can improve LCL-filtered inverter performance and minimize their implementation costs are summarized.

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Section: Ad Subject To Different Options Of Single Statementioning

confidence: 99%

Section: Current Distortion Caused By Grid Voltage Harmonicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Xie

2017

J. Mod. Power Syst. Clean Energy

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“…In order to mitigate the effect of the grid voltage on the quality of LCL-filter currents, a feed-forward loop of the grid voltage and the multiple resonant regulators at the harmonic frequencies of grid voltages are applied in the current loop. According to (15), setting 1-GN(s)G1(s) to zero and adopting approximate full compensation approach, the feed-forward function is derived as (19) Considering that derivative functions are difficult to be implemented and mainly for middle-and higher-frequency harmonics, and the noise amplification problems would reduce the stability margin, hence (19) is approximated by a first order low pass filter, and the higher order differential terms are neglected to avoid high frequency instabilities [29], [33]. As shown in Fig.…”

Section: And W(s)=g1(s)g2(s)mentioning

confidence: 99%

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

Han¹,

Shen²,

Guerrero³

2016

Journal of Power Electronics

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Grid-connected inverters (GCIs) with LCL output filter have the ability of attenuating high-frequency (HF) switching ripples. However, by using only grid-current control, the system is prone to resonances if it is not properly damped, and the current distortion would be amplified significantly under highly distorted grid conditions. In this paper, a synchronous reference frame equivalent proportional-integral (SRF-EPI) controller in αβ stationary frame using the parallel virtual resistance-based active damping (PVR -AD) strategy for grid-interfaced distributed generation (DG) systems to suppress the LCL resonance is proposed. Although both proportional-resonant (PR) controller in αβ stationary frame and PI controller in dq synchronous frame achieve zero steady-state error, the amplitude-and phase-frequency characteristics differ greatly from each other except for the reference tracking at fundamental frequency. Therefore, an accurate SRF-EPI controller in αβ stationary frame is established to achieve precise tracking accuracy. Moreover, the robustness, harmonic rejection capabilities, and influence of control delay are investigated by the Nyquist stability criterion when the PVR-based AD method is adopted. Furthermore, the grid voltage feed-forward and multiple PR controllers are integrated in the current loop to mitigate the current distortion introduced by the grid background distortion. Besides, the parameters design guidelines are presented to show the feasibility and effectiveness of the proposed strategy. Finally, simulation and experimental results are provided to validate the feasibility of the proposed control approach.

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“…G ff is the grid voltage feed-forward function, and in most cases, it can be simplified to 1 Fig. 1 Topology of a three-phase LCL filtered grid-connected inverter Stability of LCL-filtered grid-connected inverters with capacitor current feedback active… 585 (G ff & 1) when the grid voltage is mainly distorted by low-frequency harmonics [19].…”

Section: Introductionmentioning

confidence: 99%

Stability of LCL-filtered grid-connected inverters with capacitor current feedback active damping considering controller time delays

Xia

Kang

2017

J. Mod. Power Syst. Clean Energy

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This paper investigates the stability of LCL-filtered grid-connected inverters with capacitor current feedback (CCF) active damping. The impact of time delays in the digital controller on active damping and its equivalent virtual impedance is analyzed. The inherent relationship between these time delays and stability is illustrated. Specially, a critical value of the CCF active damping coefficient k damp_c is proposed to define three distinct regions of stability evaluation. If k damp_c [ 0, a sufficient but smaller damping coefficient (k damp \ k damp_c ) is recommended as optimum damping solution; if k damp_c = 0, system will be unstable irrespective of active damping; and if k damp_c \ 0, active damping is not necessary to design a stable system. Necessary conditions to ensure stability are identified; guidelines for controller design are then presented to optimize the performance of active damping and dynamic response. Simulation and experimental results confirm the presented analysis.

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Full Feedforward of Grid Voltage for Grid-Connected Inverter With LCL Filter to Suppress Current Distortion Due to Grid Voltage Harmonics

Cited by 315 publications

References 23 publications

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

Stability of LCL-filtered grid-connected inverters with capacitor current feedback active damping considering controller time delays

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